A United Airlines flight made a U-turn after a man yelling "jihad" rushed the cockpit, a government official said, adding that the man had no known terrorist connection. Other passengers tackled him. FULL STORY

Embattled Rep. Aaron Schock announced Tuesday he would resign his seat at the end of the month, in the wake of a congressional ethics investigation into reports that he used taxpayer money to fund lavish trips and events.

On Monday, an unruly passenger rushed toward the cockpit of a United Airlines plane, screaming "jihad, jihad" on a flight that had left Washington Dulles International Airport, according to a government official. The pilot turned the plane around, and passengers subdued the man, who had, the official said, nothing apparent in his background to suggest he has a connection to terrorists.

The Pueblo Chemical Depot is set to begin destroying the United States' largest remaining stockpile of chemical weapons this week in southern Colorado. Here are nine things to know about these chemical weapons and how we got here: